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I've heard some techs have had luck flushing the linset and indoor coil, changing the TXV to the one the Payne unit specs, following ALL standard & proper installation procedures, including proper charging methods and have success.

I guess some other info about how it stopped working might be useful. I had one service call last week when it first stopped working. I had changed a very clogged filter, but the tech said I had an air restirction and it had frozen up. After new filter & time to thaw & cleaning, it worked fine for a few more days. Then, same thing -- air coming out of vents seems cold, but barely blows at all. After I turn the unit off, a bunch of water on the floor in the basement, then it'll run cold for a couple hours, but we never really get anywhere temperature-wise.

Are you sure you don't have a plugged indoor coil? If you have a new filter and air getting cold air but its not blowing hard that is a restriction in your ductwork and could be causing your coil to freeze. If your filter was plugged chances are some of that dust pulled through to your indoor coil. Have the service tech use a See Snake or cut into the indoor coil to inspect it.

This is just another example of why I don't install coils for customers looking to add AC two years later, systems and components change and IMO it is only right to add/change a coil at time of AC install unless it will be impossible down the road.

You may

want to get a second opinion on this. "pressures are bad" can be caused by a number of reasons, poor air flow being one of them. I seriously doubt the system would have worked at all with a R-22 valve in place although stranger things have happened. Maybe the service tech had "tunnel vision" when he looked at the system and assumed the valve was not changed.